.pen {
    width: 100%;
    height: 170px;
    float: left;
    background: #f5f5f5;
}

.pen_bx {
    width: 1227px;
    height: 120px;
    margin: auto;
    margin-top: 25px;
}

img {
    width: 100%;
    height: 100%;
}